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Top Forums Shell Programming and Scripting AWK FS with ignore space option Post 302694311 by Corona688 on Thursday 30th of August 2012 11:10:47 AM
Old 08-30-2012
Quote:
Originally Posted by tprabhaker
Thanks a lot, it's woks perfectly, can you please explain about the following code.
Code:
OLDIFS="$IFS"
IFS="|"
set -- $line
IFS="$OLDIFS"

IFS is a special variable which controls string splitting in shell. Ordinarily it splits on spaces, but it can split on other things as well. So:

1) Save default value of IFS for later.
2) Set IFS to |
3) Set the $1 $2 $3 $4 variables to $line, splitting on |
4) Restore IFS to its original value

You can also use IFS in concert with READ, like

IFS="|" read A B C D where read will split upon |, not whitespace. Because IFS is prefixed to that line, IFS will be changed only for that line and does not need to be restored. This doesn't work for set for some reason.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgawk | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for gawk is available on http://opensolaris.org. Free Software Foundation Nov 3 1999 IGAWK(1)
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